Zusammenfassung
We employ the B -> pi from form factors obtained from QCD light-cone sum rules and calculate the B -> pi lv(l) width (l = e, mu in units of 1/vertical bar V-ub vertical bar(2) integrated over the region of accessible momentum transfers, 0 <= q(2) <= 12.0 GeV2. Using the most recent BABAR Collaboration measurements we extract vertical bar V-ub vertical bar = (3050(-0.33)(+0.38)vertical bar(th) +/- ...
Zusammenfassung
We employ the B -> pi from form factors obtained from QCD light-cone sum rules and calculate the B -> pi lv(l) width (l = e, mu in units of 1/vertical bar V-ub vertical bar(2) integrated over the region of accessible momentum transfers, 0 <= q(2) <= 12.0 GeV2. Using the most recent BABAR Collaboration measurements we extract vertical bar V-ub vertical bar = (3050(-0.33)(+0.38)vertical bar(th) +/- 0.11 vertical bar(exp)) x 10(-3.) The The sum rule results for the form factors, taken as an input for a z-series parametrization, yield the q(2) shape in the whole semileptonic region of B -> pi lv(l). We also present the charged lepton energy spectrum in this decay. Furthermore, the current situation with B -> lambda v(tau) is discussed from the QCD point of view. We suggest using the ratio of the B -> pi tau v(tau) and B -> pi lv(l) (l = mu, e) widths as an additional test of the standard model. The sensitivity of this observable to new physics is illustrated by including a charged Higgs-boson contribution in the semileptonic decay amplitude.
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